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-rw-r--r--include/linux/slub_def.h201
1 files changed, 201 insertions, 0 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
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1#ifndef _LINUX_SLUB_DEF_H
2#define _LINUX_SLUB_DEF_H
3
4/*
5 * SLUB : A Slab allocator without object queues.
6 *
7 * (C) 2007 SGI, Christoph Lameter <clameter@sgi.com>
8 */
9#include <linux/types.h>
10#include <linux/gfp.h>
11#include <linux/workqueue.h>
12#include <linux/kobject.h>
13
14struct kmem_cache_node {
15 spinlock_t list_lock; /* Protect partial list and nr_partial */
16 unsigned long nr_partial;
17 atomic_long_t nr_slabs;
18 struct list_head partial;
19};
20
21/*
22 * Slab cache management.
23 */
24struct kmem_cache {
25 /* Used for retriving partial slabs etc */
26 unsigned long flags;
27 int size; /* The size of an object including meta data */
28 int objsize; /* The size of an object without meta data */
29 int offset; /* Free pointer offset. */
30 unsigned int order;
31
32 /*
33 * Avoid an extra cache line for UP, SMP and for the node local to
34 * struct kmem_cache.
35 */
36 struct kmem_cache_node local_node;
37
38 /* Allocation and freeing of slabs */
39 int objects; /* Number of objects in slab */
40 int refcount; /* Refcount for slab cache destroy */
41 void (*ctor)(void *, struct kmem_cache *, unsigned long);
42 void (*dtor)(void *, struct kmem_cache *, unsigned long);
43 int inuse; /* Offset to metadata */
44 int align; /* Alignment */
45 const char *name; /* Name (only for display!) */
46 struct list_head list; /* List of slab caches */
47 struct kobject kobj; /* For sysfs */
48
49#ifdef CONFIG_NUMA
50 int defrag_ratio;
51 struct kmem_cache_node *node[MAX_NUMNODES];
52#endif
53 struct page *cpu_slab[NR_CPUS];
54};
55
56/*
57 * Kmalloc subsystem.
58 */
59#define KMALLOC_SHIFT_LOW 3
60
61#ifdef CONFIG_LARGE_ALLOCS
62#define KMALLOC_SHIFT_HIGH 25
63#else
64#if !defined(CONFIG_MMU) || NR_CPUS > 512 || MAX_NUMNODES > 256
65#define KMALLOC_SHIFT_HIGH 20
66#else
67#define KMALLOC_SHIFT_HIGH 18
68#endif
69#endif
70
71/*
72 * We keep the general caches in an array of slab caches that are used for
73 * 2^x bytes of allocations.
74 */
75extern struct kmem_cache kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
76
77/*
78 * Sorry that the following has to be that ugly but some versions of GCC
79 * have trouble with constant propagation and loops.
80 */
81static inline int kmalloc_index(int size)
82{
83 if (size == 0)
84 return 0;
85 if (size > 64 && size <= 96)
86 return 1;
87 if (size > 128 && size <= 192)
88 return 2;
89 if (size <= 8) return 3;
90 if (size <= 16) return 4;
91 if (size <= 32) return 5;
92 if (size <= 64) return 6;
93 if (size <= 128) return 7;
94 if (size <= 256) return 8;
95 if (size <= 512) return 9;
96 if (size <= 1024) return 10;
97 if (size <= 2 * 1024) return 11;
98 if (size <= 4 * 1024) return 12;
99 if (size <= 8 * 1024) return 13;
100 if (size <= 16 * 1024) return 14;
101 if (size <= 32 * 1024) return 15;
102 if (size <= 64 * 1024) return 16;
103 if (size <= 128 * 1024) return 17;
104 if (size <= 256 * 1024) return 18;
105#if KMALLOC_SHIFT_HIGH > 18
106 if (size <= 512 * 1024) return 19;
107 if (size <= 1024 * 1024) return 20;
108#endif
109#if KMALLOC_SHIFT_HIGH > 20
110 if (size <= 2 * 1024 * 1024) return 21;
111 if (size <= 4 * 1024 * 1024) return 22;
112 if (size <= 8 * 1024 * 1024) return 23;
113 if (size <= 16 * 1024 * 1024) return 24;
114 if (size <= 32 * 1024 * 1024) return 25;
115#endif
116 return -1;
117
118/*
119 * What we really wanted to do and cannot do because of compiler issues is:
120 * int i;
121 * for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++)
122 * if (size <= (1 << i))
123 * return i;
124 */
125}
126
127/*
128 * Find the slab cache for a given combination of allocation flags and size.
129 *
130 * This ought to end up with a global pointer to the right cache
131 * in kmalloc_caches.
132 */
133static inline struct kmem_cache *kmalloc_slab(size_t size)
134{
135 int index = kmalloc_index(size);
136
137 if (index == 0)
138 return NULL;
139
140 if (index < 0) {
141 /*
142 * Generate a link failure. Would be great if we could
143 * do something to stop the compile here.
144 */
145 extern void __kmalloc_size_too_large(void);
146 __kmalloc_size_too_large();
147 }
148 return &kmalloc_caches[index];
149}
150
151#ifdef CONFIG_ZONE_DMA
152#define SLUB_DMA __GFP_DMA
153#else
154/* Disable DMA functionality */
155#define SLUB_DMA 0
156#endif
157
158static inline void *kmalloc(size_t size, gfp_t flags)
159{
160 if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
161 struct kmem_cache *s = kmalloc_slab(size);
162
163 if (!s)
164 return NULL;
165
166 return kmem_cache_alloc(s, flags);
167 } else
168 return __kmalloc(size, flags);
169}
170
171static inline void *kzalloc(size_t size, gfp_t flags)
172{
173 if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
174 struct kmem_cache *s = kmalloc_slab(size);
175
176 if (!s)
177 return NULL;
178
179 return kmem_cache_zalloc(s, flags);
180 } else
181 return __kzalloc(size, flags);
182}
183
184#ifdef CONFIG_NUMA
185extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
186
187static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
188{
189 if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
190 struct kmem_cache *s = kmalloc_slab(size);
191
192 if (!s)
193 return NULL;
194
195 return kmem_cache_alloc_node(s, flags, node);
196 } else
197 return __kmalloc_node(size, flags, node);
198}
199#endif
200
201#endif /* _LINUX_SLUB_DEF_H */
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